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  2. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Blue–yellow color blindness can be caused by sildenafil, an active component of Viagra. [49] Hydroxychloroquine can also lead to hydroxychloroquine retinopathy, which includes various color defects. [50] Exposure to chemicals such as styrene [51] or organic solvents [52] [53] can also lead to color vision defects.

  3. Monochromacy - Wikipedia

    en.wikipedia.org/wiki/Monochromacy

    Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats.

  4. Achromatopsia - Wikipedia

    en.wikipedia.org/wiki/Achromatopsia

    If the light level during testing is optimized, achromats may achieve corrected visual acuity of 20/100 to 20/150 at lower light levels, regardless of the absence of color. [citation needed] The fundus of the eye appears completely normal. [citation needed] Achromatopsia can be classified as complete or incomplete. In general, symptoms of ...

  5. Blue-cone monochromacy - Wikipedia

    en.wikipedia.org/wiki/Blue-cone_monochromacy

    Blue cone monochromacy (BCM) is an inherited eye disease that causes severe color blindness, poor visual acuity, nystagmus, hemeralopia, and photophobia due to the absence of functional red (L) and green (M) cone photoreceptor cells in the retina. BCM is a recessive X-linked disease and almost exclusively affects XY karyotypes.

  6. Congenital red–green color blindness - Wikipedia

    en.wikipedia.org/wiki/Congenital_red–green...

    Those with normal color vision should be able to see a green "74" on an orange background. Those with red–green color blindness may see the number "21" or no number at all, with the green and red hues appearing much more similar, if not indistinguishable. Specialty: Ophthalmology: Symptoms: Reduced color distinction along red-green axis ...

  7. Cyanopsia - Wikipedia

    en.wikipedia.org/wiki/Cyanopsia

    Cyanopsia primarily affects the retina, the light-sensitive layer at the back of the eye, and sometimes the optic nerve, which transmits visual signals to the brain. The retina contains specialized cells called photoreceptors, which are responsible for detecting light and color. In cyanopsia, these photoreceptors, particularly the ones ...

  8. Parathyroid disease - Wikipedia

    en.wikipedia.org/wiki/Parathyroid_disease

    Parathyroid auto transplantation is part of the treatment when a patient has hyperparathyroidism and three or four parathyroid glands were already removed, but during the surgery one of the glands (in the case of the removal of three) is relocated at another part of the body to make, the procedure less risky another procedure.

  9. Aniridia - Wikipedia

    en.wikipedia.org/wiki/Aniridia

    Aniridia is the absence of the iris, a muscular structure that opens and closes the pupil to allow light into the eye. It is also responsible for eye color. Without it, the central eye appears all black. It can be congenital, in which both eyes are usually involved, or caused by a penetrant injury. [1]

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